1.rata rata dari 6,8,9,7,8,6,7,8,7,9 2.jumlah kelereng 4 anak 48 rata ratanya 3.rata rata dari 1,3,2,1,4,1 4.data berat badan 70,61,83,79,84,72,86,96,80,81 rata

1) x = (2 × 6) + (3 × 7 ) + (3 × 8) + (2 × 9) / (2 + 3 + 3 + 2)
x = (12 + 21 + 24 + 18 ) / 10
x = 75 / 10
x = 7,5

2) x = 48 / 4
x = 12

3) x = (1 + 1 + 1 + 2 + 3 + 4) / 6
x = 12 / 6
x = 2

4) x = (70 + 61 + 83 + 79 + 84 + 72 + 86 + 96 + 80 + 81 ) / 10
x = 792 / 10
x = 79,2

5) x = (13 + 5 + 4 + 5 + 9 + 18) / 6
x = 54 / 6
x = 9 lusin

1. 6 + 6 + 7 + 7 + 7 + 8 + 8 + 8 + 9 + 9 = 75 / 10
= 7, 5
2. 48 / 4 = 12
3. 1 + 1 + 1 + 2 + 3 + 4 = 12 / 6 = 2
4. 61 + 72 + 70 + 83 + 79 + 84 + 86 + 96 + 80 + 81 = 792 / 10 = 79, 2
5. (13, 5 × 12) + (4, 5 × 12) + (9× 12) + (18×12)
= 162 + 54 + 108 + 216 = 540 / 4 = 135

Maaf kalau salah